|From|To|Name|Party|Position|
|---|---|---|---|---|
|1870|1897|Eugène Bernain|||
|1897||Albert Le Barillier|||
|1935|1937|Daubin||Doctor|
|1937|1941|François Dommain|Radical||
|1971|1993|Victor Mendiboure|UDF||
|1993|1999|Michel Bonnet|UDF||
|1999|2001|Alain Lamassoure|UDF|Vice President of the UDF Advisor to the Court of Auditors|
|2001|2008|Robert Villenave|UDF PS|Vice-President of CABAB Vice-President of Côte Basque-Adour agglomeration|

Question: what are the number of mayors that were of the udf party?
Answer: 4